Initial Scene classes.
Fix build with precompiled headers.
Merge branch 'master' of https://github.com/realXtend/tundra-urho3d
Build kNet separately and Urho3D without networking support so that kNet classes can be properly accessed. Clean up deps code. Fix scene classes to compile on Android. Fix ambiguity between function Name() and the Name component in several classes by renaming the function to GetName().